Hoisting-scaffold.



S. D.' WHEELER.

HolsfmmSGAPPOLD.

APPLmJrIoNl FILED nso, '9, 190s. No xonm.

v Q Ww AQ PATBNTBD MAY 31, 1904.

" UNITED STATES Patented May 31, 1904.

PATENT OEEICE.

SAMUEL D.l WHEELER, OFFOWLSTOVVN, GEORGIA, ASSIGNOR OF ONE* HALF TO ISAAC B. GRIFFIN, OF FOVVLSTOVVN, GEORGIA.

HolsTlNvG-SVCAFFOLD.

SPECIFICATION forming part of Letters Patent No. 761,343, :dated May 31, 1904.

l Application led December 9, 1903. Serial No. 184,463. (No model.)

To a/ZZ whom if may concern; Y Y

Be it known that I, SAMUEL D. WHEELER, a citizen of the United States, residing at Fowlstown, in the county of Decatur and State of Georgia, have invented a new and useful Hoisting-Scaffold, of which the following is a specification.

My invention relates to scaffolds such as are employed for raising workmen and their material to operate at an elevated position, and has for its objects to produce a comparatively simple inexpensive device of this character in which the raising and lowering operation may be'readily performed by one occupying th platform or scaffold proper.

With these and other*l objects in view the invention comprises the novel features of construction and combination of parts more fully hereinafter described.A

In the accompanying drawings, Figure 1 is a side sectional elevationof a scaffold embodying my invention. Fig. 2 is an end elevation of the same. l

Y- Referring to the drawings, 1 designates a supporting base adapted to rest upon the ground and having a pair of spaced vertical standards 2 arising therefrom and connected at their upper ends by a cross-beam or other connecting piece 3, said standards being strengthened in their upright positions by diagonal bracing members-or beams 4, extending between the same and the base 1, and are provided with longitudinal slots or ways 5.`

6 designates the platform or scaffold proper, composed of wood or other suitable material and having depending side walls 6a secured to its longitudinal edges. Extending transversely between the'walls 5 at the longitudinal center of the scaffoldl is a removable cy ends of the scaffold, adjacent to which latter there `also extend transversely between the side walls pivoting-rods 10, to which the members' 8 may be shifted when found desirable, as hereinafter explained. vThese sustaining members, which consist, preferably, of metal bars provided 'upon their outer edges with teethor other engaging devices 11, are crossed one over the other to opposite sides of the longitudinal 'center of the scaffold and above a supporting member or rod 12, with which the teeth 11 engage and which extends transversely between and is sustained by the standards 2 vertically beneath theguides 5. There are preferably four of the members 8, mounted in pairs upon the rods 9 and connected at their lower ends by cross-pieces 13, to which are attached ropes or other flexible elements 14, extending upward through guide-openings 15 to the upper face of the platform 5.Y

Attached to the opposite ends of the yplatform .5 are ropes or other flexible elements 16, which are extended to and through a pulley 17, suspended from the crossfpiece 3, said ropes being crossed to opposite sides ofthe pulley. There is also attached to and depending from the scaffold end operating-ropes 18, secured to the rods 10.

In practice when it isl desired to raise the scaffold the operator pulls alternately upon operator grasps the ropes 16 and then pulls alternately upon the ropes 14, which action swings first one pair and then the other of the members 8 out of engagement with the support 12, thus permitting them to move downward step by step or tooth by tooth until the scaffold has descended sufciently. It will be understood, of course, that during'both of these operations when one pair of Amembers is out ofthe other pair will lbe in engagementwith the bar 12 and that when the scaffold is at rest both pairs of the members vengage the bar.

The elevating operation may be performed from the ground by exerting' traction upon the ropes 18 to rock the platform. Also if it is desired to adjust the scaffold for a lower maximum height the members 8 are shifted to the pivots 10.

From the foregoing it is apparent that I produce a simple and inexpensive device which will admirably perform its functions and one in which the raising and lowering of the scaffold may be performed by a person occupying the same. In attaining these ends I do not limit myself to the precise details herein set forth, as minor changes may be made without departing from the spirit of the invention.

Having thus described my invention, what I claim isl. In a scaffold, the combination with a frame, of a support carried thereby, a platform sustained for vertical movement in the frame, crossed sustaining members connected with the platform and having teeth engaging the support, said members being operable by the rocking of the platform for raising and lowering the latter, and means for rocking the platform. I v

2. In a scaffold, the combination with a frame, of a support carried thereby, a platform sustained for vertical Inovement in the frame, crossed sustaining members pivotally connected with the platform and having teeth engaging the support, said members being operable by the rocking of the platform for raising and lowering the latter, a pulley snstained by the frame, and flexible elements extending through the pulley and connected with the platform for rocking the latter.

3. Ina scaffold, the combination with a pair of standards, of a transverse supporting-rod y carried thereby, a platform having sliding connection with the standards, crossed sustaining members connected with the platform and having teeth engaging the rod, said members beingoperable bythe rockingof the platform for raising and lowering the latter, and means for rocking the platform.

4. In a scaffold, the combination with a frame, of a horizontal supporting-rod carried thereby, a platform sustained for vertical movement in the frame, crossed sustaining members pivotally connected with the platform and having teeth for engaging the rod, said members being operable by the rocking of the platform for raising and lowering of the latter, and operating-ropes for rocking the platform.

In testimony that I claim the foregoing as my own I have hereto aiiixed my signature in the presence of two witnesses.

SAMUEL D. WHEELER.

IVitnesses:

J. F. CLINARD, W. M. GRIFFIN. 

